Oil burner for furnaces



R; LpADoRAN- o'IL BURNER Fon' FURNAcEs Filed Nov. 9, 1923 llllylllll!) mum t @geul 2M I g5/gw y h Patented Apr. 15, 1924.

UNITED STATES Rom-.yar I.. DoRAN, or CHICAGO, ILLINOIS.

OIL BURNER FOR FURNACES.

Application led November 9, 1923. Serial No. 673,687.

To all whom/15' may concern.'

Be it known that I, ROBERT L. DORAN, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a new and-useful Improvement in Oil Burners for Furnaces, of which the following is a specii'ication.

This invention relates to the class of oil burners designed for the purpose of converting by heat a liquid fuel into a gas and burning the gas in order to avoid the necessity of using a mechanical device for vaporizing the fuel.

The purposes of the invention are to provide a liquid fuel burner of this class which is capable of operating with a high degree of eiiciency even though the consumption of fuel may be at a low rate to permit of the delivery of only a moderate quantity of heat. lt is a further object of the invention to provide for the delivery offuel in a desired definite ratio between the main gas generator which supplies gas to the main burner and a subordinate generator which supplies gas to a burner for this subordinate generator and also to a burner for heating the main gas generator.

The objects of the invention are accomplished by the construction shown in the drawing, which is a perspective view of the apparatus.

rThe main features of the construction to which this invention relates is a main burner head, the flat upper surface of which carries a large number of foraminous refractory disks from which the gas is burned. These disks become incandescent from the heat of the flame and therefore insure practically complete combustion since the gas and air passing through the disks are immediately heated to the ignition point and the combustion is to a great extent completed before the flame may be chilled by spreading very far away from the burner. Therefore, the combustion taking place close to the burner, .keeps the refractory disks in a highly heated state, which in turn serves to heat the gas at the time it enters the flame.

The burner head communicates with an air and gas mixing tube. The gas is projected intothe centerof the open endA of this tube and the air is drawn in around the sides of the gas jet. This gas jet is controlled by a needle valve located at the end of the tubular gas generator. Liquid fuel is delivered to the opposite end of the generator from a source of supply not shown in the drawing.

Below this main gas generator is a burner, the function of which solely is to heat the gas generator. This burner receives gas from a subordinate gas generator which subordinate generator also supplies gas to a subordinate gas burner in position to heat the same. The subordinate gas generator receives liquid fuel from the source of supply but through a separate valve controlled conduit from the valve controlled conduit leading to the main gas generator. A

With this arrangement the exact quantity of fuel required by the subordinate burners is fed to the subordinate generator independently of the main supply of fuel passing through the main gas generator to the main burner head. While this particular arrangement is simple and the structure may be economically manufactured by the use of inexpensive castings and littings the appliance will operate continuously without attention and with an extremely high degree of efliciency merely because it brings the fuel oil into proper condition for immediate combustion and because there is no opportunity for the gas becoming chilled and condensed between the points of generation and the consumption thereof as by an excess quantity of cold air being blown into the gas.

The parts of the construction above described are indicated by number in the drawing, the main burner head 1 being shown as supporting a large number of refractory perforated disks 2 through which the gas passes from the hollow body 3 of the burner. The burner head is supported upon an adjustable base l and the body part 3 thereof communicates with a gas pipe or mixing chamber 5. The open end of the mixing chamber is provided with an adjustable sleeve 6, controlling the area of a space 7 between the end of this sleeve and a disk 8 mounted upon the end of a main gas generator tube 9. This tube has a gas outlet passing through the center of disk 8, which outlet is controlled by a needle valve 10. The maingas generator receives liquid fuel from the small wire tube conduit 11 communicating with its opposite end and which is controlled by a valve 12 between the conduit 1l and the main fuel supply conduit 13. A branch conduit 14 from the supply conduit 13 is controlled by valve 15 and leads to a subordinate gas generator 15 mounted over a small burner 17 so asV to be heated by the latter. The gas generated in tube 16 passes through a small outlet orifice 18 where the gas is mixed With a supply of air entering at the lower end 19 of a hollow casting 2O which communicates with a mixing chamber 21 into which the gas from the subordinate generator 16 is projected. From the mixing chamber 21 the mixture passes into the hollow burner body 22 of burner 17, part of this mixture being burned at the foraminous burner tips 23 of burner 17 and the remainder of the mixture passes through the elbow 211 connecting the burner body 22 with the body 25 of a larger subordinate burner 26 located below the main gas generator 9. This larger subordinate burner, like the two other burners, is provided with foraminous refractory tips 27.

In operation of the device, it is first started by heating the subordinate generator 16 by means of a wick surrounding the burner tips 23. Suilicient gas is by this means generated in the subordinate generator 1G to supply the burner over the length of time required for bringing about the continuous generation of gas. The burner 17 merely has the required capacity for insuring a proper delivery of gas to itself and to the burner 26. Even though the fuel supply to these two burners is a very little quantity, minute jets of hot flame are projected against the generators 16 and 9 due to the use of the refractory burner tips which become lincandescent in operation.

Although but one specific embodiment of this invention has been herein shown andl described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as dened by the following claim.

I claim:

A fuel oil burner comprising a primary burner head, a conduit leading thereto and having provision for taking in air, a gas generating conduit having an, outlet into said burner conduit, means for delivering liquid fuel to said generating conduit, a subordinate burner located below said generating conduit, a subordinate gas generating conduit and a subordina-te burner located below said subordinate generating conduit, means for delivering liquid fuel to said subordinate gas generating conduit,

and means for conducting gas from said subordinate gas 'generating conduit mixing the gas with au' and delivering the mixture to both of the subordinate burners.

as Y Y The gas is mixed with air like A 

